Is the cartridge body touching the LP when you hear "flubbing"? Which is what I asked earlier. If yes, then yes there may be a problem with your new blue stylus. Its suspension may have collapsed. This could be because it was defective from new or because you have set VTF much too high or even because of a big error in setting VTA. But the first thing is to observe whether the cartridge body is intermittently touching the LP surface.